:root {
  color-scheme: light;
  --background: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --muted: #86868b;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #007aff;
  --accent-soft: rgba(0, 122, 255, 0.1);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--background);
}

body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 50% -20%, rgba(0, 122, 255, 0.12), transparent 34rem),
    var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  width: min(100%, 880px);
  margin: 0 auto;
  padding: 72px 24px 40px;
}

.hero {
  padding: 72px 0 40px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--secondary);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 8vw, 76px);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: 0;
}

.subtitle {
  max-width: 620px;
  margin: 22px auto 0;
  color: var(--secondary);
  font-size: clamp(18px, 3.5vw, 24px);
  line-height: 1.5;
}

.card {
  margin: 0 auto;
  padding: clamp(24px, 5vw, 48px);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.intro {
  color: var(--secondary);
  font-size: 18px;
  text-align: center;
}

.actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.action-link,
.mail-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 14px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  text-align: center;
}

.action-link.secondary {
  background: var(--accent-soft);
  color: var(--accent);
}

.action-link:hover,
.mail-button:hover {
  text-decoration: none;
  filter: brightness(0.98);
}

.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.brand-link {
  color: var(--text);
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 18px;
  color: var(--secondary);
  font-size: 15px;
}

.content {
  padding: clamp(24px, 5vw, 48px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.content header {
  margin-bottom: 32px;
}

.content h1 {
  font-size: clamp(32px, 6vw, 50px);
  line-height: 1.12;
}

.effective-date {
  margin: 14px 0 0;
  color: var(--secondary);
  font-size: 16px;
}

.content h2 {
  margin: 34px 0 12px;
  font-size: 22px;
  line-height: 1.35;
}

.content p {
  margin: 12px 0;
  color: var(--secondary);
  font-size: 16px;
}

.content ul {
  margin: 12px 0 18px;
  padding-left: 1.4em;
  color: var(--secondary);
}

.content li {
  margin: 6px 0;
}

.support-list {
  padding: 20px;
  background: var(--background);
  border-radius: 18px;
}

.footer {
  margin-top: 44px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

.back-link {
  display: inline-flex;
  margin-top: 28px;
  color: var(--secondary);
  font-weight: 600;
}

@media (max-width: 640px) {
  .page {
    padding: 40px 18px 28px;
  }

  .hero {
    padding: 42px 0 28px;
  }

  .actions {
    grid-template-columns: 1fr;
  }

  .top-nav {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 28px;
  }

  .nav-links {
    gap: 14px;
  }

  .card,
  .content {
    border-radius: 22px;
  }
}